1. Houston, Texas; Loma Linda, California; Philadelphia, Pennsylvania; and Stanford, California
2. Memorial Northwest Otolaryngology Associates, Houston, TX,
3. Division of Otolaryngology–Head and Neck Surgery
4. Loma Linda Medical Center, Department of Otorhinolaryngology–Head and Neck Surgery, University of Pennsylvania
5. Department of Otolaryngology–Head and Neck Surgery, Stanford University